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back firing at high revs

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Old May 7, 2008 | 09:32 PM
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Default back firing at high revs

im new to cossies so help me out

my 2wd saph backfires & splutters at high revs so whats the crack there as its hampering its performance a bit & the boost is peeking at around 14psi

it has green injectors, bajoo chip, rs 500 intercooler, collins actuater, 3 bar map sensor, k&n & stainless exhaust & maybe a hybrid turbo but im not sure, has dyno graphs for 340bhp

im thinking maybe a set up as it sat for nearly 8 months plus, i havent changed the plugs & leads yet either

cheers
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Old May 7, 2008 | 09:37 PM
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Plugs would be a good start,if it was me i'd change fluids cam belt etc too .
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Old May 7, 2008 | 09:44 PM
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change everything you can afford to as it will all need doing at somepoint!
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Old May 8, 2008 | 06:47 AM
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Good advice, just change the usuall suspects, ie plugs, make sure it has decent leads, inspect the insulation on the phase sensor, change the CTS, get it set up for peace of mind.
Do the FUEL FILTER as well, although this small item will not give the misfire, it is so often neglected, but is so easy to do, ok then it can be a royal pain in the rear with brackets breaking etc but is important!!
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Last edited by tabetha; May 8, 2008 at 06:48 AM.
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Old May 8, 2008 | 07:33 AM
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ok i'll get strait on to that today, what sort of boost should a car of this spec be running would you say??
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Old May 8, 2008 | 07:59 AM
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around 20-22 boost would be fine boss
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Old May 8, 2008 | 12:37 PM
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I would set it very low, and take it to a rolling road for a fuelling check etc where they can adjust it to what chip supplier says is correct for the chip.
On this power usually around 24/26psi.
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Old May 8, 2008 | 12:40 PM
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If dark greens id say 26 psi although i ran mine on 28 lol.
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Old May 8, 2008 | 02:00 PM
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Originally Posted by KSA-Cossie
If dark greens id say 26 psi although i ran mine on 28 lol.

Thats fine mid range, but high up you're likely to blow it up

And seeing as this guys just bought a Cossie, and will want as much power from it as possible, I'm sure he'll set it to 28psi and it'll be fine for a couple of weeks lol
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Old May 8, 2008 | 02:17 PM
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Although i did ask stu @ MSD if that was ok to do 1st .
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Old May 8, 2008 | 02:30 PM
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You never know how accurate the gauge is tho
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Old May 8, 2008 | 02:44 PM
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secs monitor james,but get your driftpal.
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Old May 8, 2008 | 04:52 PM
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ok ive been a bit busy today but popped in to halfrauds to get plugs, leads & oil but they dont sell the plugs & leads so where would you recomend i get them & what kind??

cheers
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Old May 8, 2008 | 05:10 PM
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matt lewis off here
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Old May 8, 2008 | 05:55 PM
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As said Matt Lewis 01922 692424.
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Old May 8, 2008 | 08:40 PM
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he only sells standard items, are there fancy ones availible?

Last edited by smitsturbo; May 8, 2008 at 08:48 PM.
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Old May 8, 2008 | 08:59 PM
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MSD sells leads and plugs m8.
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Old May 8, 2008 | 09:10 PM
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just orderd them online at burtons
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Old May 9, 2008 | 05:46 AM
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I am sure Matt Lewis sells 909 leads, which are excellent leads.
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